<template>
  <view>
    <!--使用自定义搜索组件-->
    <!-- <my-search :bgcolor="'pink'" :radius="3"></my-search> -->
    <my-search @click="gotosearch"></my-search>

    <view class="scroll-view-container">
      <!-- 左侧的滑动区域-->
      <scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh + 'px'}">
        <block v-for="(item,i) in cateList" :key="i">
          <view :class="['left-scorll-view-item',i === active ? 'active' : '']" @click="activeChanged(i)">
            {{item.cat_name}}
          </view>
        </block>
      </scroll-view>
      <!-- 右侧的滑动区域-->
      <scroll-view class="right-scroll-view" scroll-y="true" :style="{height:wh + 'px'}" :scroll-top="scrollTop">
        <view class="cata-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
          <!--二级分类标题-->
          <view class="cate-lv2-title">/{{item2.cat_name}}/</view>
          <view class="cate-lv3-list">
            <!--三级分类item项-->
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <!--三级分类图片-->
              <image :src="item3.cat_icon"></image>
              <!--三级分类文本-->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        //当前设备可用高度
        wh: 0,
        cateList: [],
        active: 0,
        //二级分类的列表
        cateLevel2: [],
        scrollTop: 0
      };
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      console.log(sysInfo)
      this.wh = sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods: {
      //获取分类列表数据
      async getCateList() {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/categories')
        if (res.meta.status != 200) return uni.$showMsg()
        console.log(res)
        this.cateList = res.message
        //为二级分类赋值
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(i) {
        this.active = i
        //重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        //重新赋值顶端数据
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      //跳转到商品列表页面
      gotoGoodsList(item) {
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      gotosearch() {
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
      }
    }
  }
  //封装弹框方法
  uni.$showMsg = function(title = '数据请求失败', duration = 1500) {
    uni.showToast({
      title,
      duration,
      icon: 'none',
    })
  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;
  }

  .left-scroll-view {
    width: 120px;
  }

  .left-scorll-view-item {
    background-color: #F7F7F7;
    line-height: 60px;
    text-align: center;
    font-size: 12px;

    &.active {
      background-color: #FFFFFF;
      position: relative;

      &::before {
        content: ' ';
        display: block;
        width: 3px;
        height: 30px;
        background-color: #C00000;
        position: absolute;
        top: 50%;
        left: 0;
        transform: translateY(-50%);
      }
    }
  }

  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }

  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;

    .cate-lv3-item {
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;

      image {
        width: 60px;
        height: 60px;
      }

      text {
        font-size: 12px;
      }
    }
  }
</style>